Using the live cd 3.3 mini I :
"emerge realplayer" , it added a few extra things .
Then opened realplayer and file + open file browsed to desktop + wosp.smil
Currently listening to it. You should be bale to right click the wosp.smil file on the desktop and open with then browse to multimedia and reaplayer + bottom option = "remember application association for this file type" and press ok.
This will then be the default program for *.smil type files.
Hope this helps.
I wonder if they have a aac+ stream = 128kb/s mono stream in real = 32kb/s stereo in aac+ .